Doi Haruka, Urayama Kenji
Department of Macromolecular Science and Engineering, Kyoto Institute of Technology, Sakyo-ku, Kyoto 606-8585, Japan.
Soft Matter. 2017 Jun 21;13(24):4341-4348. doi: 10.1039/c7sm00602k.
We investigate the thermal bending behavior of liquid crystal gels with hybrid alignment (H-LCGs) accompanied by volume change in isotropic and nematic solvents. The curvature (r) of H-LCGs in each solvent markedly depends on the temperature (T) in the nematic state including the reversal of the bending direction, as in the case of the corresponding elastomers in the dry state (H-LCE). The thermal bending of three systems-H-LCGs in isotropic and nematic solvents and H-LCE-differs significantly in several aspects including the T range where r depends on T and the total variation of r. The differences in these features among the three systems result from the differences in the magnitude as well as the T-dependence of the nematic order (S), which is correlated with the T-induced volume change. We demonstrate that the T-dependence of the reduced curvature in each system is satisfactorily described by a combination of linear bending theory and the anisotropic Gaussian network model using the corresponding S-T data.
我们研究了具有混合取向的液晶凝胶（H-LCGs）在各向同性和向列型溶剂中伴随体积变化的热弯曲行为。与处于干燥状态的相应弹性体（H-LCE）情况一样，H-LCGs在每种溶剂中的曲率（r）在向列态下显著取决于温度（T），包括弯曲方向的反转。三种体系——各向同性和向列型溶剂中的H-LCGs以及H-LCE——的热弯曲在几个方面存在显著差异，包括r依赖于T的温度范围以及r的总变化。这三种体系在这些特征上的差异源于向列序（S）的大小以及对T的依赖性的差异，而向列序与T诱导的体积变化相关。我们证明，利用相应的S-T数据，通过线性弯曲理论和各向异性高斯网络模型的组合，可以令人满意地描述每个体系中约化曲率对T的依赖性。
